The attach function only attachs a copy of the data (changes to the data
don't show up in the attached copy). Also you need to tell R what to do
with the result of as.ordered (where to save it).
Try something like:
> table$V3 <- as.ordered(table$V3)
Or
> table <- transform(table, V3=as.ordered(V3) )
Hope this helps,
--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at intermountainmail.org
(801) 408-8111
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Birgit Lemcke
> Sent: Thursday, August 23, 2007 11:28 AM
> To: R Hilfe
> Subject: [R] ordered factors in data.frame
>
> Hello I need a tiny peace of help. (PPC Mac Os X 10.4.10; R 2.5.1)
>
> I have a data.frame with numeric and factor variables.
> I would like to convert same of the factors to ordered factors.
>
> I tried with:
>
> attach (table)
>
> as.ordered (V3)
>
> but this gives me only the V3 Vector as ordred back but in
> the data.frame (str(Table)) it is still not ordered.
>
> How can I do that?
>
> Thanks for your help.
>
> I am still a beginner.
>
> Greetings
>
> Birgit
>
> Now I would like to
> Birgit Lemcke
> Institut f?r Systematische Botanik
> Zollikerstrasse 107
> CH-8008 Z?rich
> Switzerland
> Ph: +41 (0)44 634 8351
> birgit.lemcke at systbot.uzh.ch
>
>
>
>
>
>
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